Frederick siemens



(No Model.)

I. SIEMENS.

GAS LAMP.

No. 399,289. Patented Mar. 12, 1889.

IINTTEE STATES PATENT OFFICE.

FREDERICK SIEMENS, ()F DRESDEN, SAXONY, HER-MANY.

GAS-LAM P.

SPECIFICATION forming part of Letters Patent No. 399,289, dated March12, 1889.

Application filed July 12, 1886. Serial No. 207,810. (No model.)Patented in Germany July 15, 1884,1Io. 31,122. and in England July 24,1884, No. 10,560

To all who/1L it 11mg 00/00/3111.:

Be it known that I, FREDERICK sIEMENs, a citizen of Saxon y, residing atDresden, Saxony, in the Empire of Germany, have invented a new anduseful Improvement in Gas-Lamps, (for which I have obtained a patent inGreat Britain, No. 10,560, hearing date the 24th. day of July, 1884:,and in Germany, No. 31,122, bearing date the 15th day of July, 188.4,)of which the "following is a specification.

My invention relates to the construction of a gas-lamp, the flame ofwhich burns steadily without being inclosed by a glass, and is suppliedat the upper part of areflecting-bell with air heated by the products ofcombustion, therebeing no parts under the flame to interfere with thedownward passage of the light.

Figures 1' and i of the accompanying drawings are vertical sections,Fig. 2 being taken on the line X X of Fig. 1, and Figs. 3 and 4 areplans, Fig. 4: being takenv as from below; also, Pg 5 is a sectionalplan on Y Y of liig. 1, showing one form of lamp according to myinvention suitable for a light in such a position that a shadow on oneside is not objcctionable. Fig. (3 is a vertical sect-ion, and Fig. 7 isa plan from below, of a sin'iilarlan'lp made in ci rcular form, so as topresent no side shadows.

In this lamp two flat flame burners are placed side by side within abell-reflector, R. The products of comlmstion pass through a month, 1',which should be so limited. in area. and suited to the form of: theflames as to give passage for little or no air besides. The productsdescend a channel, a, and ascend o to the chimney 0. Air entering bylateral oritices ascends channels h on each side of a, becoming heatedon its way, and issues into the upper part of the reflector to supplythe flames. 'Ihrough the crown of (b there is a small aperture, (L2, forpassage of a portion of the hot products of combustion to start thechimney-draft.

Fig. 6 is a vertical section, and Fig. 7 a plan looking from below,showing a lamp with channels operating as above described, but arrangedin circular "form surrounding the light, the inner wall of theair-channel 1) constituting a reflector. The partition separating thechannels (I. and a is preferably covered with a layer ofimperfectly-conducting material, such as asbestus sheet, so as to retainin the channel (1' a greater amount of heat available for heating theair ascending the channel Z). The partition separating a from 7),instead of being plain, may be corrugated or provided with projectionsor ribs, so as to increase its heat absorbing, conducting, and radiatingpower; and in like manner corrugations, projections, or ribs may be usedin the channels of the lamp shown in Figs. 1 to 5, inclusive. In bothlamps single burners may be used, or double burners, as shown, ormultiple burners, care being taken to suit the size and form of themouth r to the flames, so that practically only products of combustionshall pass through it, without taking with them any material part of theair supplied from the channels I). \V hen two or more burners are used,they maybe placed at an angle one to the other, instead of parallel, asshown in the drawings.

Having thus described the nature of my invention and the best means Iknow for carrying the same into practical eitect, I claim Thecombination of the burner not inelosed by a glass or globe, thebell-reflectorRwithin which the burner is placed, the mouth '7', throughwhich the products of combustion pass, and which deflects the air uponthe flame, the channels (T (1, through which the products of combustionpass to the chimney, the channel I), in which the ascending air isheated and caused to issue into the upper part of the reflector tosupply the flame, and a small aperture, (1 for the passage of a portionof the hot products of combustion to start the chimney-draft, as and forthe purpose described.

In testimony whercof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERICK SIEMENS.

Witnesses:

(-. MAX IIERRMANN,

U71 [cf Engineer, Dresden. MAX ScnULzE,

.l ngcnz'cul', Dresden.

